Just wanted to post some more information now that the event has been going on for a couple of days.
Gnosta and I have done several of the summons and have a pretty good routine down. We are able to pretty much each tank a boss, with additional party members mainly focusing on DPS.
I want to thank everyone who has helped me in my mount quest so far! With your help we have been able to perfect the strategy for this boss and make the summoning experience quick and easy for all those involved.
We have been successful in using a summoning portal to summon in a party member, kill bosses, and use the portal again to swap out the next batch of characters. That is approximately a 5 minute turn around time for summon - boss kill - summon. Not bad!
Characters just need to be lvl 75 to summon this boss, and since Gnosta and I can manage the encounter mechanic the character does not need to be skilled... or equiped... they don't even need to stay alive. In some cases it is easier if they hide somewhere or just die.... I'm looking at you Yarmon!
Some people have expressed their desire for some of the other dropped items (Rose Helm, Gas Mask, Toxic Wasteling) I will do my best to make the group composition favorable to these requests, however, my main focus will be about making the character rotation as fast as possible. I am very appreciative of those people able to offer up their summons to my rocket mount goal and I want to be efficient and respectful of their time.
Thank you all again for your help so far! I am feeling really positive about this mission and I will see you all later today... and tomorrow... and the next day...

~Zug